US10753466B2 - Transmission control device and transmission control method - Google Patents

Transmission control device and transmission control method Download PDF

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Publication number
US10753466B2
US10753466B2 US15/559,029 US201615559029A US10753466B2 US 10753466 B2 US10753466 B2 US 10753466B2 US 201615559029 A US201615559029 A US 201615559029A US 10753466 B2 US10753466 B2 US 10753466B2
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Prior art keywords
pressure
pulley
command
command pressure
line
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US20180080548A1 (en
Inventor
Haruka OZONO
Youji ITOU
Kosuke Abe
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Nissan Motor Co Ltd
JATCO Ltd
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Nissan Motor Co Ltd
JATCO Ltd
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Assigned to NISSAN MOTOR CO., LTD., JATCO LTD reassignment NISSAN MOTOR CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ITOU, Youji, ABE, KOSUKE, OZONO, Haruka
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/66—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing specially adapted for continuously variable gearings
    • F16H61/662—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing specially adapted for continuously variable gearings with endless flexible members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/0021—Generation or control of line pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/12—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H9/00—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by endless flexible members
    • F16H9/02—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by endless flexible members without members having orbital motion
    • F16H9/04—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by endless flexible members without members having orbital motion using belts, V-belts, or ropes
    • F16H9/12—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by endless flexible members without members having orbital motion using belts, V-belts, or ropes engaging a pulley built-up out of relatively axially-adjustable parts in which the belt engages the opposite flanges of the pulley directly without interposed belt-supporting members
    • F16H9/16—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by endless flexible members without members having orbital motion using belts, V-belts, or ropes engaging a pulley built-up out of relatively axially-adjustable parts in which the belt engages the opposite flanges of the pulley directly without interposed belt-supporting members using two pulleys, both built-up out of adjustable conical parts
    • F16H9/18—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by endless flexible members without members having orbital motion using belts, V-belts, or ropes engaging a pulley built-up out of relatively axially-adjustable parts in which the belt engages the opposite flanges of the pulley directly without interposed belt-supporting members using two pulleys, both built-up out of adjustable conical parts only one flange of each pulley being adjustable
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/12—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures
    • F16H2061/1232—Bringing the control into a predefined state, e.g. giving priority to particular actuators or gear ratios
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/12—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures
    • F16H2061/1256—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures characterised by the parts or units where malfunctioning was assumed or detected
    • F16H2061/1284—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures characterised by the parts or units where malfunctioning was assumed or detected the failing part is a sensor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
    • F16H59/36—Inputs being a function of speed
    • F16H59/38—Inputs being a function of speed of gearing elements
    • F16H59/40—Output shaft speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
    • F16H59/36—Inputs being a function of speed
    • F16H59/38—Inputs being a function of speed of gearing elements
    • F16H59/42—Input shaft speed

Definitions

  • the present invention relates to a transmission control device for controlling a transmission and a transmission control method for controlling a transmission.
  • JP5-46465B A technique of performing a fail-safe at the time of failure in a rotation speed sensor of a secondary pulley of a continuously variable transmission is disclosed in JP5-46465B.
  • the continuously variable transmission is shifted by a single pressure regulation method of fixing control pressure of the secondary pulley to line pressure.
  • the line pressure transmitted straightaway as the control pressure of the secondary pulley is fixed to the maximum value.
  • control pressure of a primary pulley generated from the line pressure is made to have the minimum value and a speed ratio is fixed to the maximum speed ratio, that is, the lowest speed ratio. Thereby, belt slippage is prevented in this technique.
  • the present invention is achieved in consideration of such a technical problem, and an object thereof is to provide a transmission control device for controlling a transmission and a transmission control method for controlling a transmission capable of suppressing a radical change in a speed ratio upon performing a fail-safe at the time of failure of a specific section.
  • a transmission control device for controlling a transmission in a first aspect serving as one aspect of the present invention is adapted to control the transmission having a variator at least having a pulley whose groove width is changed by controlling pulley pressure and a belt looped over the pulley, a hydraulic line-pressure actuator adapted to control actual pressure of line pressure serving as source pressure of the pulley pressure, and a hydraulic pulley-pressure actuator adapted to control actual pressure of the pulley pressure.
  • the transmission control device has a failure determination unit adapted to determine failure of a specific section, a line command pressure control unit adapted to variably control line command pressure serving as command pressure to the hydraulic line-pressure actuator, and in a case where the failure is determined, to fix the line command pressure to a line pressure set value which is a first predetermined value or more, and a pulley command pressure control unit adapted to variably control pulley command pressure serving as command pressure to the hydraulic pulley-pressure actuator, and in a case where the failure is determined, to fix the pulley command pressure to a pulley pressure set value which is a second predetermined value or more.
  • the pulley command pressure control unit starts a change in the pulley command pressure after start of a change in the line command pressure, and controls the pulley command pressure in such a manner that the pulley command pressure takes a first predetermined time to have the pulley pressure set value.
  • a transmission control device is adapted to control a transmission.
  • the transmission includes: a variator having a primary pulley whose groove width is changed by controlling primary pressure, a secondary pulley whose groove width is changed by controlling secondary pressure, and a belt looped over the primary pulley and the secondary pulley; a hydraulic line-pressure actuator adapted to control actual pressure of line pressure serving as source pressure of the primary pressure and the secondary pressure; a hydraulic primary-pressure actuator adapted to control actual pressure of the primary pressure; and a hydraulic secondary-pressure actuator adapted to control actual pressure of the secondary pressure.
  • the transmission control device having the following configuration is provided, that is, the transmission control device includes: a failure determination unit adapted to determine failure of a specific section; a line command pressure control unit adapted to variably control line command pressure serving as command pressure to the hydraulic line-pressure actuator, and in a case where the failure is determined, to fix the line command pressure to a line pressure set value which is a first predetermined value or more; a primary command pressure control unit adapted to variably control primary command pressure serving as command pressure to the hydraulic primary-pressure actuator, and in a case where the failure is determined, to fix the primary command pressure to a primary pressure set value which is a third predetermined value or more; and a secondary command pressure control unit adapted to variably control secondary command pressure serving as command pressure to the hydraulic secondary-pressure actuator, and in a case where the failure is determined, to fix the secondary command pressure to a secondary pressure set value which is a fourth predetermined value or more.
  • the primary command pressure control unit starts a change in the primary command pressure after start of a change in the line command pressure, and controls the primary command pressure in such a manner that the primary command pressure takes a second predetermined time to have the primary pressure set value.
  • the secondary command pressure control unit starts a change in the secondary command pressure after start of the change in the line command pressure, and controls the secondary command pressure in such a manner that the secondary command pressure takes a third predetermined time to have the secondary pressure set value.
  • the primary command pressure control unit further starts the change in the primary command pressure before start or after start of the change in the secondary command pressure.
  • a transmission control method controls a transmission.
  • the transmission includes: a variator having at least a pulley whose groove width is changed by controlling pulley pressure and a belt looped over the pulley; a hydraulic line-pressure actuator adapted to control actual pressure of line pressure serving as source pressure of the pulley pressure; and a hydraulic pulley-pressure actuator adapted to control actual pressure of the pulley pressure.
  • the transmission control method includes: determining failure of a specific section; variably controlling line command pressure serving as command pressure to the hydraulic line-pressure actuator, and in a case where the failure is determined, fixing the line command pressure to a line pressure set value which is a first predetermined value or more; and variably controlling pulley command pressure serving as command pressure to the hydraulic pulley-pressure actuator, and in a case where the failure is determined, fixing the pulley command pressure to a pulley pressure set value which is a second predetermined value or more, wherein upon controlling the pulley command pressure, in a case where the failure is determined, a change in the pulley command pressure is started after start of a change in the line command pressure, and the pulley command pressure is controlled in such a manner that the pulley command pressure takes a first predetermined time to have the pulley pressure set value.
  • the line command pressure is fixed to the line pressure set value and the pulley command pressure is fixed to the pulley pressure set value.
  • the actual pressure of the line pressure and the actual pressure of the pulley pressure can be increased. Therefore, a fail-safe that suppresses generation of belt slippage can be performed. The same is applied to the second aspect.
  • the change in the pulley command pressure is started after start of the change in the line command pressure. Therefore, according to the first and third aspects, a timing of starting the change to the set value is differentiated between the line command pressure and the pulley command pressure. Thus, a radical change in the pulley pressure can be hindered. The same is applied to the second aspect.
  • the pulley command pressure is controlled in such a manner that the pulley command pressure takes the first predetermined time to have the pulley pressure set value. Therefore, according to the first and third aspects, at least the pulley pressure to be increased at last in the fail-safe is gradually changed. Thus, the speed ratio can be gradually changed. The same is applied to the second aspect.
  • FIG. 1 is a diagram showing major portions of a vehicle including a transmission.
  • FIG. 2 is a flowchart showing one example of control performed by a controller.
  • FIG. 3 is a flowchart showing a first specific example of the control performed by the controller.
  • FIG. 4 is a diagram showing one example of a timing chart corresponding to the flowchart of FIG. 3 .
  • FIG. 5 is a flowchart showing a second specific example of the control performed by the controller.
  • FIG. 6 is a diagram showing one example of a timing chart corresponding to the flowchart of FIG. 5 .
  • actual pressure is mainly used for emphasizing that the pressure is actual pressure or for making a distinction from command pressure. Therefore, in this description, even when the pressure is actual pressure, the pressure is sometimes not specifically called “actual pressure”.
  • FIG. 1 is a diagram showing major portions of a vehicle including a transmission 100 .
  • the vehicle includes an engine 1 , a torque converter 2 , a variator 20 , a sub-transmission mechanism 30 , an axle 4 , and drive wheels 5 .
  • the engine 1 forms a power source of the vehicle.
  • the torque converter 2 transmits power via a fluid.
  • the variator 20 and the sub-transmission mechanism 30 output inputted rotation speed as rotation speed in accordance with a speed ratio.
  • the speed ratio has a value obtained by dividing the inputted rotation speed by the outputted rotation speed.
  • the axle 4 is a drive axle formed by a reduction gear and a differential device. The power of the engine 1 is transmitted to the drive wheels 5 via the torque converter 2 , the variator 20 , the sub-transmission mechanism 30 , and the axle 4 .
  • the variator 20 is a continuously variable transmission mechanism including a primary pulley 21 , a secondary pulley 22 , and a belt 23 .
  • the primary pulley 21 will be also simply referred to as the pulley 21
  • the secondary pulley 22 will be also simply referred to as the pulley 22 .
  • the primary pulley 21 includes a fixed conical plate, a movable conical plate, and a hydraulic cylinder 21 a .
  • the secondary pulley 22 includes a fixed conical plate, a movable conical plate, and a hydraulic cylinder 22 a .
  • the fixed conical plate and the movable conical plate are arranged in a state where sheave surfaces face each other to form a V groove.
  • the hydraulic cylinder 22 a is provided on a back surface of the movable conical plate to displace the movable conical plate in the axial direction.
  • the belt 23 is looped over the pulley 21 and the pulley 22 .
  • a V belt can be used as the belt 23 .
  • Primary pressure serving as control pressure of the primary pulley 21 acts on the hydraulic cylinder 21 a .
  • Secondary pressure serving as control pressure of the secondary pulley 22 acts on the hydraulic cylinder 22 a .
  • Both the primary pressure and the secondary pressure are one example of pulley pressure serving as control pressure of a pulley.
  • width of the V groove is changed by controlling the primary pressure.
  • width of the V groove is changed by controlling the secondary pressure.
  • a contact radius of the pulley 21 and the belt 23 is changed.
  • a contact radius of the pulley 22 and the belt 23 is changed. Therefore, by controlling the width of the V grooves of the pulley 21 and the pulley 22 , the speed ratio of the variator 20 can be steplessly changed.
  • setting is made in such a manner that a pressure receiving area of the primary pulley 21 and a pressure receiving area of the secondary pulley 22 are equal.
  • a return spring adapted to bias the movable conical plate is provided in the secondary pulley 22 .
  • the sub-transmission mechanism 30 is a multi-gear transmission mechanism having gear positions of two forward gear positions and one backward gear position.
  • the sub-transmission mechanism 30 has a first speed gear position and a second speed gear position whose speed ratio is less than the first speed gear position as the forward gear positions.
  • the sub-transmission mechanism 30 is provided on the output side of the variator 20 in series in a power transmission path running from the engine 1 to the drive wheels 5 .
  • the sub-transmission mechanism 30 may be directly connected to the variator 20 or may be indirectly connected to the variator 20 via other configurations such as a gear train.
  • the speed ratio is changed in each of the variator 20 and the sub-transmission mechanism 30 . Therefore, in the vehicle, shift is performed in accordance with a through speed ratio which is a speed ratio of the entirety of the variator 20 and the sub-transmission mechanism 30 obtained by multiplying the speed ratio of the variator 20 by the speed ratio of the sub-transmission mechanism 30 .
  • the variator 20 forms an automatic transmission mechanism 3 together with the sub-transmission mechanism 30 .
  • the variator 20 and the sub-transmission mechanism 30 may be formed as structurally individual transmission mechanisms.
  • the vehicle further includes an oil pump 10 , a hydraulic control circuit 11 , and a controller 12 .
  • the oil pump 10 generates hydraulic pressure.
  • a mechanical oil pump to be driven by the power of the engine 1 can be used as the oil pump 10 .
  • the hydraulic control circuit 11 adjusts the hydraulic pressure generated by oil supply of the oil pump 10 and transmits to portions of the variator 20 and the sub-transmission mechanism 30 .
  • the hydraulic control circuit 11 includes a line pressure solenoid valve 11 s , a primary pressure solenoid valve 11 a , and a secondary pressure solenoid valve 11 b .
  • the line pressure solenoid valve 11 s will be referred to as the SOL 11 s .
  • the primary pressure solenoid valve 11 a will be referred to as the SOL 11 a
  • the secondary pressure solenoid valve 11 b will be referred to as the SOL 11 b.
  • the SOL 11 s is one example of a hydraulic line-pressure actuator adapted to control actual pressure of line pressure.
  • the SOL 11 s controls the actual pressure of the line pressure in accordance with line command pressure serving as command pressure to the SOL 11 s .
  • the line pressure is hydraulic pressure serving as source pressure of the primary pressure and the secondary pressure, the pressure being set in such a manner that slippage of the belt 23 is not generated.
  • Both the SOL 11 a and the SOL 11 b are one example of a hydraulic pulley-pressure actuator adapted to control actual pressure of the pulley pressure.
  • the SOL 11 a is one example of a hydraulic primary-pressure actuator adapted to control actual pressure of the primary pressure.
  • the SOL 11 b is one example of a hydraulic secondary-pressure actuator adapted to control actual pressure of the secondary pressure.
  • the SOL 11 a controls the actual pressure of the primary pressure in accordance with primary command pressure serving as command pressure to the SOL 11 a .
  • the SOL 11 b controls the actual pressure of the secondary pressure in accordance with secondary command pressure serving as command pressure to the SOL 11 b .
  • Both the primary command pressure and the secondary command pressure are one example of pulley command pressure serving as command pressure to the hydraulic pulley-pressure actuator.
  • the following solenoid valve is used as the SOL 11 s , the SOL 11 a , and the SOL 11 b . That is, a solenoid valve in which a linear solenoid actuator adapted to perform linear drive in accordance with the magnitude of an energized electric current is used in a solenoid portion is used. Alternatively, a solenoid valve in which a valve mechanism adapted to perform pressure regulation by changing the degree of drainage in accordance with the drive of the solenoid portion is used in a valve portion is used. In such a solenoid valve, a drainage port is fully closed in a case where the command pressure has the maximum value. A normal-high solenoid valve in which a command of energization stop is a command of command pressure of the maximum value is used as the SOL 11 s , the SOL 11 a , and the SOL 11 b.
  • the SOL 11 s is further combined with a line pressure control valve adapted to adjust the hydraulic pressure generated by the oil pump 10 to generate the line pressure.
  • the SOL 11 a is further combined with a primary pressure control valve adapted to generate the primary pressure from the line pressure
  • the SOL 11 b is further combined with a secondary pressure control valve adapted to generate the secondary pressure from the line pressure.
  • the SOL 11 s of such a configuration controls the actual pressure of the line pressure by generating control pressure of the line pressure control valve, in other words, pilot pressure in accordance with the line command pressure, and controlling the line pressure control valve by the generated control pressure. That is, in the present embodiment, the SOL 11 s has a linear solenoid valve adapted to generate the pilot pressure as the above solenoid valve, and has the line pressure control valve to be driven by the pilot pressure generated by the linear solenoid valve to generate the line pressure. The same is applied to the SOL 11 a and the SOL 11 b.
  • the controller 12 controls the hydraulic control circuit 11 .
  • Output signals of a rotation sensor 41 , a rotation sensor 42 , and a rotation sensor 43 are inputted to the controller 12 .
  • the rotation sensor 41 is a sensor corresponding to a variator input side rotation sensor for detecting rotation speed on the input side of the variator 20 .
  • the rotation sensor 42 is a sensor corresponding to a variator output side rotation sensor for detecting rotation speed on the output side of the variator 20 . Specifically, the rotation sensor 42 detects the rotation speed on the output side of the variator 20 and on the input side of the sub-transmission mechanism 30 .
  • the rotation sensor 43 is a sensor corresponding to a sub-transmission mechanism output side rotation sensor for detecting rotation speed on the output side of the sub-transmission mechanism 30 .
  • the rotation speed on the input side of the variator 20 is rotation speed of an input shaft of the variator 20 .
  • the rotation speed on the input side of the variator 20 may be rotation speed at a position of the above power transmission path to sandwich, for example, a gear train with the variator 20 .
  • the same is applied to the rotation speed on the output side of the variator 20 and the rotation speed on the output side of the sub-transmission mechanism 30 .
  • the rotation sensor 41 , the rotation sensor 42 , and the rotation sensor 43 are used, for example, for detecting an actual speed ratio of the variator 20 and the sub-transmission mechanism 30 .
  • output signals of an accelerator position sensor 44 , an inhibitor switch 45 , an engine rotation sensor 46 , and the like are inputted to the controller 12 .
  • the accelerator position sensor 44 detects an accelerator position APO which represents an operation amount of an accelerator pedal.
  • the inhibitor switch 45 is one example of a selection range detection unit adapted to detect a selection range of the transmission 100 , and detects a position of a selector lever.
  • the engine rotation sensor 46 detects rotation speed Ne of the engine 1 .
  • the controller 12 can detect vehicle speed VSP on the basis of the output signal of the rotation sensor 43 .
  • the controller 12 generates a shift control signal on the basis of these signals.
  • the shift control signal includes signals for giving a command for the line command pressure, the primary command pressure, and the secondary command pressure. Therefore, the controller 12 variably controls the line command pressure, the primary command pressure, and the secondary command pressure by generating the shift control signal on the basis of various signals described above.
  • the controller 12 outputs the generated shift control signal to the hydraulic control circuit 11 .
  • the hydraulic control circuit 11 controls the actual pressure of the line pressure, the primary pressure, and the secondary pressure on the basis of the shift control signal from the controller 12 , and performs switching of a hydraulic path or the like. Specifically, the hydraulic control circuit 11 controls the actual pressure for each of the line pressure, the primary pressure, and the secondary pressure in such a manner that the actual pressure becomes the command pressure.
  • the hydraulic pressure is transmitted from the hydraulic control circuit 11 to the portions of the variator 20 and the sub-transmission mechanism 30 in accordance with the shift control signal.
  • the speed ratio of the variator 20 and the sub-transmission mechanism 30 is changed to be a speed ratio in accordance with the shift control signal, that is, a target speed ratio.
  • the target speed ratio can be set in accordance with the accelerator position APO and the vehicle speed VSP.
  • the target speed ratio may be set in accordance with a throttle position TVO of a throttle valve adapted to adjust an intake air amount of the engine 1 instead of the accelerator position APO.
  • the line command pressure, the primary command pressure, and the secondary command pressure can be set in accordance with the target speed ratio.
  • the transmission 100 is an automatic transmission having, in addition to the hydraulic control circuit 11 and the controller 12 adapted to control the speed ratio in such a way, the variator 20 , the sub-transmission mechanism 30 , the rotation sensor 41 , the rotation sensor 42 , the rotation sensor 43 , and the inhibitor switch 45 .
  • the accelerator position sensor 44 and the engine rotation sensor 46 may be grasped as a configuration of the transmission 100 .
  • Each of the rotation sensor 41 , the rotation sensor 42 , the rotation sensor 43 , and the inhibitor switch 45 is one example of a detection unit used for control of the speed ratio of the transmission 100 , and forms a specific section serving as an object whose failure is to be determined.
  • the accelerator position sensor 44 and the engine rotation sensor 46 may also be grasped as the detection unit.
  • the hydraulic control circuit 11 and the controller 12 form a transmission control device 50 adapted to perform control in the transmission 100 .
  • the transmission control device 50 will be simply referred to as the control device 50 .
  • FIG. 2 is a flowchart showing one example of the control performed by the controller 12 .
  • the controller 12 can repeatedly execute the process shown in this flowchart for every extremely-short time.
  • Step S 1 the controller 12 determines whether or not the specific section is abnormal.
  • Step S 1 the controller 12 can determine, for example, whether or not disconnection is caused in the specific section.
  • the known technique and other appropriate techniques may be applied to the determination of whether or not the specific section is abnormal.
  • Step S 1 the controller 12 determines that the specific section is abnormal in a case where at least part of the specific section is abnormal. Specifically, the controller 12 determines that the specific section is abnormal in a case where at least any of the rotation sensor 41 , the rotation sensor 42 , the rotation sensor 43 , and the inhibitor switch 45 is abnormal. When a negative determination is provided in Step S 1 , the process is forwarded to Step S 11 .
  • Step S 11 the controller 12 performs normal speed ratio control.
  • the controller 12 controls the speed ratio of the variator 20 by variably controlling the line command pressure, the primary command pressure, and the secondary command pressure.
  • Step S 11 the line command pressure is controlled in accordance with input torque to the transmission 100 in such a manner that slippage of the belt 23 is not generated.
  • the primary command pressure and the secondary command pressure are controlled in accordance with the target speed ratio in such a manner that the speed ratio of the variator 20 becomes the target speed ratio.
  • Step S 11 the primary command pressure and the secondary command pressure are further controlled in accordance with the input torque to the transmission 100 . This is to control these command pressure in such a manner that slippage of the belt 23 is not generated by corresponding to the line command pressure controlled in such a manner that slippage of the belt 23 is not generated.
  • Step S 1 When a positive determination is provided in Step S 1 , the process is forwarded to Step S 2 .
  • the controller 12 fixes the line command pressure to a line pressure set value Ps.
  • the line pressure set value Ps is a first predetermined value or more, and in the present embodiment, the maximum value of the line command pressure.
  • the first predetermined value may be a value with which slippage of the belt 23 can be suppressed.
  • Step S 2 the controller 12 controls the line command pressure in such a manner that the line command pressure takes a fourth predetermined time to have the line pressure set value Ps.
  • the fourth predetermined time can be a time generated by making an inclination in a graph showing a change in the line command pressure in accordance with time in a case where the line command pressure does not have the line pressure set value Ps.
  • the fourth predetermined time may be a time determined in accordance with such an inclination or the line command pressure at the time of starting the control of this step. In a case where the line command pressure originally has the line pressure set value Ps, the fourth predetermined time may be zero.
  • Step S 3 the controller 12 fixes the secondary command pressure to a secondary pressure set value Pb.
  • the secondary pressure set value Pb is one example of a pulley pressure set value which is a second predetermined value or more.
  • the secondary pressure set value Pb is a fourth predetermined value or more, which is the second predetermined value for the secondary command pressure, and in the present embodiment, the secondary pressure set value Pb is the maximum value of the secondary command pressure.
  • the second predetermined value and the fourth predetermined value may be values with which slippage of the belt 23 can be suppressed.
  • Step S 3 the controller 12 controls the secondary command pressure in such a manner that the secondary command pressure takes a first predetermined time, specifically, a third predetermined time which is the first predetermined time for the secondary command pressure to have the secondary pressure set value Pb.
  • the first predetermined time and the third predetermined time are similar to the fourth predetermined time at the time of fixing the line command pressure to the line pressure set value Ps.
  • the controller 12 starts a change in the secondary command pressure serving as one example of the pulley command pressure after start of a change in the line command pressure by performing the process of Step S 2 and successively performing the process of Step S 3 . After Step S 3 , the process of this flowchart is once ended.
  • Step S 2 fixing the line command pressure to the line pressure set value Ps means that the line command pressure is maintained to have the line pressure set value Ps until the failure is removed by repair or the like. The same is applied to Step S 3 .
  • the control shown in FIG. 2 can also be applied to a case where the variator 20 is formed as a variator for the single pressure regulation method of fixing the primary pressure or the secondary pressure to the line pressure.
  • the single pressure regulation method is a pressure regulation method in which a greater-than or less-than relationship is not switched between the primary pressure and the secondary pressure. Therefore, in the single pressure regulation method, the greater-than or less-than relationship between the primary pressure and the secondary pressure is maintained to be primary pressure secondary pressure or primary pressure secondary pressure.
  • the control shown in FIG. 2 can be applied straightaway.
  • the primary command pressure and a primary pressure set value Pa may be applied in Step S 3 in place of the secondary command pressure and the secondary pressure set value Pb.
  • the primary pressure set value Pa is one example of the pulley pressure set value as well as the secondary pressure set value Pb.
  • the primary pressure set value Pa is a third predetermined value or more, which is the second predetermined value for the primary command pressure, and in the present embodiment, the maximum value of the primary command pressure.
  • the third predetermined value may be a value with which slippage of the belt 23 can be suppressed.
  • the controller 12 can perform control in accordance with the object whose failure is to be determined as described below.
  • FIG. 3 is a flowchart showing a first specific example of the control performed by the controller 12 .
  • This example shows a case where the rotation sensor 41 and the rotation sensor 42 are objects whose failure is to be determined.
  • the object whose failure is to be determined may be at least any of the rotation sensor 41 and the rotation sensor 42 .
  • Step S 1 ′ the controller 12 determines whether or not the rotation sensor 41 or the rotation sensor 42 is abnormal. When a negative determination is provided in Step S 1 ′, the process is forwarded to Step S 11 . When a positive determination is provided in Step S 1 ′, the process is forwarded to Step S 2 and then further forwarded to Step S 3 . After Step S 3 , the process is forwarded to Step S 4 ′.
  • Step S 4 ′ the controller 12 continuously changes the speed ratio of the variator 20 by variably controlling the primary command pressure. Specifically, the controller 12 continuously changes the speed ratio of the variator 20 by controlling the primary command pressure in accordance with the vehicle speed VSP. In Step S 4 ′, the controller 12 controls the primary command pressure by open-loop control.
  • Step S 4 ′ the controller 12 can continuously change the speed ratio of the variator 20 within a range of a speed ratio region from the lowest speed ratio to the middle speed ratio by variably controlling the primary command pressure. Thereby, startability of the vehicle can be ensured.
  • the middle speed ratio is an intermediate speed ratio with which the primary pressure and the secondary pressure are equal to each other.
  • the controller 12 can variably control the primary command pressure in a mode not in accordance with the input torque to the transmission 100 .
  • the controller 12 starts a change in the primary command pressure after start of the change in the secondary command pressure by performing the process of Step S 3 and successively performing the process of Step S 4 ′.
  • the controller 12 may start the change in the primary command pressure before start of the change in the secondary command pressure by performing the process of Step S 4 ′ before the process of Step S 3 .
  • the controller 12 may perform control in which the primary command pressure and the primary pressure set value Pa are applied in Step S 3 in place of the secondary command pressure and the secondary pressure set value Pb and also perform control in which the secondary command pressure is applied in Step S 4 ′ in place of the primary command pressure.
  • the speed ratio of the variator 20 can be continuously changed within a range of a speed ratio region from the middle speed ratio to the highest speed ratio.
  • the highest speed ratio is the minimum speed ratio.
  • the control shown in FIG. 3 may be applied to a case where at least any of the rotation sensor 43 and the inhibitor switch 45 is the object whose failure is to be determined.
  • the primary command pressure can be controlled in accordance with the vehicle speed VSP by detecting the vehicle speed VSP on the basis of an output of other sensors such as a vehicle speed sensor used in an ABS (Antilock Brake System).
  • FIG. 4 is a diagram showing one example of a timing chart corresponding to the flowchart of FIG. 3 .
  • FIG. 4 shows the primary command pressure, the secondary command pressure, and the line command pressure as parameters.
  • the line command pressure is controlled to take the fourth predetermined time to have the line pressure set value Ps from a timing T 2 which is the timing T 1 or later. At this time, the line command pressure is controlled to be gradually increased.
  • the line command pressure has the line pressure set value Ps at a timing T 3 which is a timing after the timing T 2 .
  • the line command pressure is fixed to the line pressure set value Ps at the timing T 3 or later.
  • the secondary command pressure is controlled to take the third predetermined time to have the secondary pressure set value Pb.
  • the secondary command pressure is controlled to be gradually increased.
  • the change in the secondary command pressure can be started, for example, after the line command pressure is fixed to the line pressure set value Ps.
  • the change in the secondary command pressure may be started before the line command pressure is fixed to the line pressure set value Ps.
  • the secondary command pressure has the secondary pressure set value Pb at a timing T 4 which is a timing after the timing T 3 .
  • the secondary command pressure is fixed to the secondary pressure set value Pb at the timing T 4 or later.
  • the primary command pressure is controlled in accordance with the vehicle speed VSP.
  • control of the primary command pressure can be started after the line command pressure is fixed to the line pressure set value Ps and the secondary command pressure is fixed to the secondary pressure set value Pb.
  • FIG. 5 is a flowchart showing a second specific example of the control performed by the controller 12 .
  • This example shows a case where the rotation sensor 43 and the inhibitor switch 45 are objects whose failure is to be determined.
  • the object whose failure is to be determined may be at least any of the rotation sensor 43 and the inhibitor switch 45 .
  • Step S 1 ′′ the controller 12 determines whether or not the rotation sensor 43 or the inhibitor switch 45 is abnormal. When a negative determination is provided in Step S 1 ′′, the process is forwarded to Step S 11 . When a positive determination is provided in Step S 1 ′′, the process is forwarded to Step S 2 and then further forwarded to Step S 3 . After Step S 3 , the process is forwarded to Step S 4 ′′.
  • Step S 4 ′′ the controller 12 fixes the primary command pressure to the primary pressure set value Pa. Specifically, in Step S 4 ′′, the controller 12 controls the primary command pressure in such a manner that the primary command pressure takes the first predetermined time, specifically, a second predetermined time which is the first predetermined time for the primary command pressure to have the primary pressure set value Pa.
  • the second predetermined time is similar to the fourth predetermined time at the time of fixing the line command pressure to the line pressure set value Ps.
  • the controller 12 may start the change in the primary command pressure before start of the change in the secondary command pressure by performing the process of Step S 4 ′′ before the process of Step S 3 .
  • the control shown in FIG. 5 may be applied to a case where at least any of the rotation sensor 41 and the rotation sensor 42 is the object whose failure is to be determined. That is, even in a case where the vehicle speed VSP can be detected on the basis of an output of the rotation sensor 43 , the primary command pressure may be fixed to the primary pressure set value Pa.
  • FIG. 6 is a diagram showing one example of a timing chart corresponding to the flowchart of FIG. 5 .
  • FIG. 6 shows the primary command pressure, the secondary command pressure, and the line command pressure as parameters.
  • a change from the timing T 1 to the timing T 4 is similar to the case of the first specific example shown in FIG. 4 .
  • the primary command pressure is controlled to take the second predetermined time to have the primary pressure set value Pa.
  • the primary command pressure is controlled to be gradually increased.
  • the change in the primary command pressure is started after the timing T 2 , that is, after start of the change in the line command pressure.
  • the change is also started after the secondary command pressure is fixed to the secondary pressure set value Pb.
  • the change in the primary command pressure may be started before the secondary command pressure is fixed to the secondary pressure set value Pb.
  • the primary command pressure has the primary pressure set value Pa at a timing T 5 which is a timing after the timing T 4 .
  • the primary command pressure is fixed to the primary pressure set value Pa at the timing T 5 or later.
  • a failure determination unit is realized by the controller 12 , specifically by part of the controller 12 functionally grasped as a portion that performs the determination of Step S 1 , Step S 1 ′, or Step S 1 ′′ described above.
  • a line command pressure control unit is realized by the controller 12 , specifically by part of the controller 12 functionally grasped as a portion that performs the process of Step S 2 and Step S 11 described above.
  • a pulley command pressure control unit is realized by the controller 12 , specifically by part of the controller 12 functionally grasped as a portion that performs the process of Step S 3 and Step S 11 , further Step S 4 ′ and Step S 11 , or Step S 4 ′′ and Step 11 described above.
  • a primary command pressure control unit is realized by the controller 12 , specifically by part of the controller 12 functionally grasped as a portion that performs the process of Step S 4 ′ and Step S 11 , or Step 4 ′′ and Step S 11 described above.
  • a secondary command pressure control unit is realized by the controller 12 , specifically by part of the controller 12 functionally grasped as a portion that performs the process of Step S 3 and Step S 11 described above.
  • the control device 50 performs control in the transmission 100 having the variator 20 which has at least the secondary pulley 22 serving as one example of the pulley and the belt 23 , the SOL 11 s , and the SOL 11 b serving as one example of the hydraulic pulley-pressure actuator.
  • the control device 50 has the controller 12 .
  • the controller 12 determines the failure of the specific section.
  • the controller 12 variably controls the line command pressure, and in a case where the failure is determined, fixes the line command pressure to the line pressure set value Ps.
  • the controller 12 variably controls the secondary command pressure serving as one example of the pulley command pressure, and in a case where the failure is determined, fixes the secondary command pressure to the secondary pressure set value Pb serving as one example of the pulley pressure set value. Further, in a case where the failure is determined, the controller 12 starts the change in the secondary command pressure after start of the change in the line command pressure and controls the secondary command pressure in such a manner that the secondary command pressure takes the first predetermined time to have the secondary pressure set value Pb.
  • the line command pressure is fixed to the line pressure set value Ps and the secondary command pressure is fixed to the secondary pressure set value Pb.
  • the actual pressure of the line pressure and the actual pressure of the secondary pressure can be increased. Therefore, a fail-safe that suppresses generation of slippage of the belt 23 can be performed.
  • the control device 50 of the above configuration Upon performing the fail-safe in such a way, in the control device 50 of the above configuration, in a case where the failure is determined, the change in the secondary command pressure is started after start of the change in the line command pressure. Therefore, with the control device 50 of the above configuration, a timing of starting the change to the set value is differentiated between the line command pressure and the secondary command pressure. Thus, a radical change in the secondary pressure can be hindered.
  • control device 50 of the above configuration at least the secondary command pressure among the line command pressure and the secondary command pressure is controlled in such a manner that the command pressure takes a predetermined time to have the set value. Therefore, with the control device 50 of the above configuration, at least the secondary pressure to be increased at last in the fail-safe is gradually changed. Thus, the speed ratio can be gradually changed.
  • control device 50 of such a configuration upon performing the fail-safe at the time of the failure of the specific section, a radical change in the speed ratio can be suppressed.
  • the control device 50 performs the control in the transmission 100 having the variator 20 which has the primary pulley 21 , the secondary pulley 22 , and the belt 23 , the SOL 11 s , the SOL 11 a , and the SOL 11 b .
  • the control device 50 has the controller 12 .
  • the controller 12 determines the failure of the specific section.
  • the controller 12 variably controls the line command pressure, and in a case where the failure is determined, fixes the line command pressure to the line pressure set value Ps.
  • the controller 12 variably controls the primary command pressure, and in a case where the failure is determined, fixes the primary command pressure to the primary pressure set value Pa.
  • the controller 12 variably controls the secondary command pressure, and in a case where the failure is determined, fixes the secondary command pressure to the secondary pressure set value Pb. Further, the controller 12 performs the following control in a case where the failure is determined. That is, the controller 12 starts the change in the primary command pressure after start of the change in the line command pressure and controls the primary command pressure in such a manner that the primary command pressure takes the second predetermined time to have the primary pressure set value Pa. The controller 12 starts the change in the secondary command pressure after start of the change in the line command pressure and controls the secondary command pressure in such a manner that the secondary command pressure takes the third predetermined time to have the secondary pressure set value Pb. Further, the controller 12 starts the change in the primary command pressure before start or after start of the change in the secondary command pressure.
  • the control device 50 of such a configuration for each of the line command pressure, the primary command pressure, and the secondary command pressure, the command pressure is fixed to the set value.
  • the fail-safe that suppresses generation of slippage of the belt 23 can be performed.
  • a radical change in relation to the line pressure can be hindered and the pressure can be gradually changed. Therefore, with the control device 50 of such a configuration, in a case where shift is performed by the double pressure regulation method, upon performing the fail-safe at the time of the failure of the specific section, a radical change in the speed ratio can be suppressed.
  • the timing of starting the change to the set value is differentiated between the primary command pressure and the secondary command pressure.
  • the SOL 11 a and the SOL 11 b scramble for the line pressure and shortage in the supplied oil amount is generated can be suppressed.
  • the line pressure serves as the primary pressure straightaway. The same is applied to the SOL 11 b.
  • the controller 12 controls the line command pressure in such a manner that the line command pressure takes the fourth predetermined time to have the line pressure set value Ps.
  • control device 50 of such a configuration in a case where the primary command pressure or the secondary command pressure has the maximum value at the time of generation of the failure, a radical change in the primary pressure or the secondary pressure due to a radical change in the line pressure can be further prevented. Therefore, with the control device 50 of such a configuration, even in such a case, a radical change in the speed ratio can be suppressed.
  • the specific section can be the rotation sensor 41 , the rotation sensor 42 , or the inhibitor switch 45 .
  • the fail-safe can be performed while suppressing a radical change in the speed ratio.
  • the transmission 100 further includes the sub-transmission mechanism 30 .
  • the specific section can also be the rotation sensor 43 . In this case, at the time of the failure of the rotation sensor 43 , the fail-safe can be performed while suppressing a radical change in the speed ratio.
  • the control device 50 can be applied to a case where for the primary pressure or the secondary pressure, the command pressure is fixed to the set value in a case where the failure is determined. Therefore, a configuration other than the detection unit used for the control of the speed ratio of the transmission 100 such as a hydraulic actuator (for example, the SOL 11 s , the SOL 11 a , the SOL 11 b , or a hydraulic step motor to be used in place of these) may be applied to the specific section.
  • a hydraulic actuator for example, the SOL 11 s , the SOL 11 a , the SOL 11 b , or a hydraulic step motor to be used in place of these

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US10371255B2 (en) * 2015-03-20 2019-08-06 Jatco Ltd Transmission control device and transmission control method
JP6559816B1 (ja) * 2018-02-08 2019-08-14 株式会社Ｓｕｂａｒｕ 無段変速機の制御装置、無段変速機、および無段変速機の制御方法
JP6670332B2 (ja) * 2018-03-07 2020-03-18 株式会社Ｓｕｂａｒｕ 変速機、変速機の制御装置、および変速機の制御方法

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EP3273109A4 (en) 2018-11-14
KR20170118791A (ko) 2017-10-25
CN107429834B (zh) 2019-06-28
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JPWO2016152333A1 (ja) 2017-12-21
US20180080548A1 (en) 2018-03-22

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